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प्रश्न
Give a chemical test to distinguish between the following gases.
H2 and O2
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उत्तर
| Hydrogen | Oxygen |
| Apply a burning splint to the gas: Pure hydrogen burns with a pale blue Flame when a burning splint is brought near it. | Apply a burning splint to the gas: It rekindles a glowing wooden splinter. |
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संबंधित प्रश्न
What do you observe when Iron nail is kept in copper sulphate solution for sometime.
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Miscible liquids having slightly different boiling points can be separated by the
- evaporation
- distillation
- fractional distillation
- sedimentation
True or false
New substances are formed in a chemical change.
Fill in the blank:
The substances formed as a result of a chemical reaction are called _______
Give balanced equation for the following conversion affected by heat alone on the substance:
Zinc carbonate to zinc oxide
Burning of paper is the best example of ______ change.
Analogy:
H2O: Water:: NaCl: ______.
Which of the following is/are true when milk changes into curd?
- Its state is changed from liquid to semi solid.
- It changes colour.
- It changes taste.
- The change cannot be reversed.
Choose the correct option from below:
How can we prevent rusting?
______ is the chemical name of limestone.
